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| Finding a Percent |
Finding a Percent
Percent literally means "out of a hundred" or "per hundred" ("cent" like century).
A percentage is just a different way of writing a decimal. For example, instead of writing 0.25, we write 25%. Or instead of writing 1.4213, we write 142.13%.
Percentages are created by moving the decimal point of a decimal two digits to the right and adding a percent sign (%) to the end of the number.
Mathematical Operations with Percentages
The simplest way to perform math with percentages is to first convert them to decimals, perform the math, then convert the result back to a percentage.
Note: Addition and subtraction can be performed without any conversions.
Addition Example
Consider the problem: 14% + 256% Simply add the numbers leave the percent sign after the result: 14 + 256 = 270%
Multiplication Example
Consider the problem: 28% * 133%. 1. Convert the percentages to decimals by moving the decimal point two spaces to the left (0.28 * 1.33) 2. Perform the mathematical operation as you would normally (0.28 * 1.33 = 0.3724) 3. Convert the result back into a percentage by moving the decimal point two spaces to the right (37.24%)
Division would follow the same steps.
More Information:
https://www.mathsisfun.com/percentage.html https://www.khanacademy.org/math/pre-algebra/pre-algebra-ratios-rates/pre-algebra-percent-problems/v/finding-percentages-example